Non-combustible Sound-absorbing Facing with Controlled Airflow Resistivity
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Solution Overview
Problem
Existing sound-absorbing materials are often combustible and have low thermostability, posing a fire hazard in environments where noise reduction is critical, forcing a trade-off between noise pollution reduction and fire safety.
Innovation Solution
A non-combustible sound-absorbing facing made from materials like glass, ceramic, or rock wool, with specific yarn weights and diameters, applied to a substrate to create a laminate with controlled airflow resistance and fire resistance, ensuring sound absorption while preventing ignition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional sound-absorbing materials (paper, cellulose, foam, cotton wool, polyester) are used, then sound absorption performance is improved, but fire safety deteriorates due to high combustibility
Solution Approach 1:
The invention uses composite materials consisting of inorganic fibres (glass, ceramic, or rock wool) bound with a binder to create a facing material that combines sound absorption capabilities with fire resistance. This composite structure allows the material to function as both a sound-absorbing layer and a fire protective barrier.
Solution Approach 2:
The invention changes the fundamental material parameters from organic combustible materials to inorganic non-combustible materials. The air-flow resistance is specifically controlled within the range of 80 to 3,000 Rayls, and weight per unit area is maintained between 20 to 1,000 g/m2, ensuring sound absorption performance while achieving non-combustibility.
2Object-affected harmful factors
If non-combustible materials are used, then fire safety is improved, but sound absorption performance deteriorates due to low porosity and high density
Solution Approach 1:
The invention employs porous inorganic fibre structures that maintain high porosity despite using non-combustible materials. The random arrangement of fibres creates numerous pathways for sound wave penetration and dissipation, while the porous structure itself contributes to sound absorption through viscous losses and thermal conduction within the pores.
Solution Approach 2:
The facing is designed with specific local properties: air-flow resistance between 80 to 3,000 Rayls and weight per unit area between 20 to 1,000 g/m2. These localized quality parameters ensure optimal sound absorption performance at the surface level where sound waves first interact with the material.
3Weight of stationary object
If lightweight sound-absorbing materials are used, then ease of installation is improved, but fire resistance deteriorates
Solution Approach 1:
The invention achieves a breakthrough by demonstrating that non-combustible inorganic fibre materials can be manufactured with weight per unit area between 20 to 1,000 g/m2. This parameter range was previously thought to be incompatible with fire resistance, but the invention proves that lightweight and non-combustible properties can coexist through proper material selection and structural design.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a safe, effective sound-absorbing laminate that maintains sound absorption performance under various conditions and withstands high temperatures, reducing noise pollution without the risk of fire hazards.
Implementation Method 1
a non-combustible sound-absorbing facing, wherein the facing has an air-flow resistance of between 80 to 3,000 Rayls
Data Source
AI summary
The present invention relates to a non-combustible, sound-absorbing facing (30) having an air flow resistivity of between 80 and 3,000 Rayls and a weight per unit area of between 20 and 1,000 g/m2 and to a laminate (10) comprising the facing (30) and a substrate (20) wherein superimposing the facing (30) on the substrate (20) forms the laminate (10) having good sound absorbing characteristics.